Submission #617050

#	Time	Username	Problem	Language	Result	Execution time	Memory
617050		Hanksburger	Power Plant (JOI20_power)	C++17	100 / 100	175 ms	29312 KiB

power

#include <bits/stdc++.h>
using namespace std;
int dp[200005], ok[200005], n, ans;
vector<int> adj[200005];
void dfs(int u, int p)
{
    int sum=0, mx=0;
    for (int v:adj[u])
    {
        if (v==p)
            continue;
        dfs(v, u);
        sum+=dp[v];
        mx=max(mx, dp[v]);
    }
    ans=max(ans, dp[u]=max(ok[u], sum-ok[u]));
    if (ok[u])
        ans=max(ans, mx+1);
}
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n;
    for (int i=1; i<n; i++)
    {
        int u, v;
        cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    for (int i=1; i<=n; i++)
    {
        char x;
        cin >> x;
        ok[i]=x-'0';
    }
    dfs(1, 1);
    cout << ans;
    return 0;
}

• Subtask 1: 6 / 6
• Subtask 2: 41 / 41
• Subtask 3: 53 / 53